.lead__subtitle{
  margin: 32px auto 0;
  max-width: 640px;
  font-style: normal;
  font-weight: 400;
  font-size: 30px;
  line-height: 36px;
  text-align: center;
  color: #FFFFFF;
}

@media screen and (max-width: 767px) {
  .lead__subtitle{
    font-size: calc( (100vw - 320px)/(768 - 320) * (30 - 16) + 16px);
  }
}

@media screen and (max-width: 450px) {
  .lead__subtitle{
    line-height: 20px;
  }
}

@media screen and (max-width: 320px) {
  .lead__subtitle{
    margin: 16px auto 0;
    font-size: 16px;
  }
}